Wetting properties of polystyrene ionomers treated with plasma source ion implantation

The wetting properties of polystyrene‐based ionomers treated with plasma source ion implantation (PSII) were investigated by the measurement of water contact angles. When sulfonated ionomers were aged for a few days, the hydrophobic recovery for the ionomers became much slower than that for the nonionic polymers. However, when the samples were aged over 20 days, the water contact angle of the ionomers converged with that of the nonionic polymer. Thus, it was concluded that the ionic interaction between the ionic groups and the presence of ionic groups together resulted in the slow hydrophobic recovery and that the aging effect was significant for the ionomers. For the methacrylate ionomer of low ion content, on the other hand, it was found that the PSII treatment produced only a small change in hydrophobic recovery behavior. Thus, it was suggested that the low ionic content coupled with the small size of the ionic unit might cause changes only of a very insignificant degree in hydrophobic recovery behavior. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2500–2504, 2002     

F离子掺杂TiO2的性能研究

以NH4F为掺杂剂，采用溶胶-凝胶法制备F离子掺杂型TiO2光催化剂，对其进行XRD、XPS和PL表征，结果表明，F离子掺杂ToO2由于Ti—F配位体的形成而能抑制金红石相的生成，同时F离子掺杂能增加TiO2表面缺陷浓度并降低Ti2P键的结合能，另外，由于F离子能取代Ti—OH配位体而降低了表面羟基氧浓度．光催化研究结果表明，F离子掺杂提高了TiO2光催化活性近1．5倍．     

乙烯装置设备失效管理

按乙烯装置中设备的功能与作用进行分类,建立了各类设备的管理信息表,分析了常见的设备失效形式和典型的失效原因,并进行了归纳。开发了设备失效管理系统软件,介绍了该软件具有的各种功能。     

挡板对陶瓷干法造粒气-固两相流混合过程的影响

为探究陶瓷干法造粒气-固两相流混合过程挡板对粉体混合效果影响,构建欧拉气-固两相流模型分析空气与粉体相互作用,简化造粒区域并建立粉体混合过程三维物理模型,采用滑移网格法、多重参考系法模拟造粒室旋转运动,修正RNG离散模型分析湍流状态.根据径向及轴向粉体体积分数分布、速度场探究不同挡板对粉体混合影响,并改进挡板位置和结构以提高粉体混合程度.结果表明:当造粒室内分别含矩形壁挡板、矩形底挡板、半圆形壁挡板时,粉体轴向体积分数高于0.27的区域分别占总面积29％、40％、37％;粉体径向体积分数高于0.29的区域分别占总面积24％、15％、33％;粉体轴向平均速度分别为0.4 m/s、0.5 m/s、0.6 m/s;对不同粒径的粉体进行密度测定实验,当造粒室内含矩形壁挡板时,粉体密度基本为1.9 g/cm3,一致性较好.该结果显示矩形壁挡板造粒室内的粉体堆积程度最低,粉体混合性能最优,该模型及结果能够有助于提高对陶瓷干法造粒室气固两相流流场的理解,并对造粒室挡板设计优化提供一定理论指导.     

Phase evolution and thermophysical properties of high-entropy RE2(Y0.2Yb0.2Nb0.2Ta0.2Ce0.2)2O7 oxides

Pursuing novel thermal barrier–coating materials with lower thermal conductivity and high-temperature stability can simultaneously improve the working efficiency and service temperature of a gas turbine. In this study, a series of high-entropy RE₂(Y_0.2Yb_0.2Nb_0.2Ta_0.2Ce_0.2)₂O₇ (RE = La, Nd, Sm, Gd, Dy, and Er) oxides were prepared though solid-state reaction. Through tuning the rare-earth cations, an order–disorder transition occurs from certain partially ordered weberite structure (C222₁) to disordered defective fluorite structure (Fm$\overline{3}$m). All the high-entropy RE₂(Y_0.2Yb_0.2Nb_0.2Ta_0.2Ce_0.2)₂O₇ oxides possess low thermal conductivity in the range of 0.91–1.34 W m⁻¹ K⁻¹ at room temperature, which can be attributed to increased lattice anharmonicity and disorder, resulting in additional phonon scattering. Herein, we proved that the incorporation of heterovalent cations at B-sites in high-entropy A₂B₂O₇ crystals is an effective strategy to reduce the thermal conductivity without compromising the decrease of oxygen vacancy. Moreover, the high-entropy RE₂(Y_0.2Yb_0.2Nb_0.2Ta_0.2Ce_0.2)₂O₇ oxides show the relatively higher thermal expansion coefficients of 10.3–10.7 × 10⁻⁶°C⁻¹ and excellent phase stability at elevated temperatures.     

利用菱镁石合成轻质碳酸镁工艺及其工业化

利用低品位的菱镁石为原料，采用碳酸法生产工艺合成轻质碳酸镁。将MgO含量≤42％的菱镁石经煅烧、磨矿、消化、过滤、碳化、热解、压滤、干燥、粉碎可得符合国际优级品轻质碳酸镁。通过工业化生产证明，此工艺技术具有投资少、成本低、质量好、效益高等特点。     

微生物转化法合成L-酪氨酸

以对羟基苯甲醛、海因、氢氧化钠为原料 ,化学合成底物对羟基苯丙酮酸。采用来自大肠杆菌的天冬氨酸转氨酶对对羟基苯丙酮酸进行生物转化 ,并对转化条件进行了初步的研究 ,最终得到L-酪氨酸 ,转化率 75 %。     

Electrical properties of (Bi3.5La0.5)Ti3O12 thin-films prepared by liquid source misted chemical deposition

The ((Bi_3.5La_0.5)Ti₃O₁₂(BLT) thin-films used in this study were fabricated on a Pt(111)/SiO₂/Si(100) substrate by a Liquid Source Misted Chemical Deposition (LSMCD) technique. X-ray diffraction patterns showed that the BLT films were crystallized and no other phases were observed when annealed above 650 ‡C. Grain size and remnant polarizations increased with increase in the annealing temperature, while leakage current densities decreased. The remnant polarizations (Pr) increased from 2.0 to 4.8 and 19.0 μC/cm2 with increase in the annealing temperature from 650 to 700 and 750 ‡C, respectively. The BLT films annealed at 700 ‡C in O₂ showed a good fatigue resistance of reduced polarization by 10% after 10⁹ switching cycles when 9 V of bipolar voltage was applied at a frequency of 40 kHz.     

用于确定双吸离心泵Suter曲线的三维内特性法研究

水泵Suter曲线是泵站水锤分析的必备条件之一。现有用于获取双吸离心泵Suter曲线的实测法具有难度大、成本高的特点,而间接插值估算法的精度又比较低,本文提出了一种通过水泵流场三维数值计算确定双吸离心泵Suter曲线的新方法,简称三维内特性法。该方法采用计算流体力学(CFD)技术,对双吸离心泵的水力模型进行三维造型、工况离散、流场计算及结果转化,以快速、准确地获取双吸离心泵Suter曲线,在正水泵工况、正水轮机工况、反水轮机工况、反水泵工况等工况下,计算出相应流量、转速、扬程和转矩关系。定量分析表明,相比于间接插值估算法,采用三维内特性法获得的Suter曲线中,Wh(x)的计算精度平均提高了39.2%,Wb(x)的计算精度平均提高了26.3%;在将采用该方法获得的双吸离心泵Suter曲线用于事故停泵工况水锤分析时,计算得到的系统最大压力降低了15.0%,管线发生汽化压力的范围缩减了81.4%,双吸离心泵的最大倒流量增大了11.9%,最大倒转速降低了6.1%,与实际测试结果更为接近。该方法为提高双吸离心泵站水锤分析精度提供了一种新技术途径。     

1101汽车底盘专用漆的研制

研制了性能优异的汽车底盘专用漆,介绍了该漆的生产配方及工艺流程,列举了该漆的性能指标及检测结果,讨论了影响该漆性能、质量的各种因素.